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Plain Paper:909Aiche.P Materials, Interfaces, and Electrochemical Phenomena A New Technique for Predicting the Shape of Solution-Grown Organic Crystals Daniel Winn and Michael F. Doherty Dept. of Chemical Engineering, University of Massachusetts, Amherst, MA 01003 A method for predicting the shape of solution-grown organic crystals is presented. The shapes depend on properties of their internal crystal structure, as well as on the processing en®ironment. The model de®eloped here can account for the effects of sol- ®ent and may be extended to account for the influence of certain types of additi®es. This method may be used as a first approach for including crystal shape in the o®erall design and optimization of organic solids] processes. The technique has been used successfully to predict the shape of adipic acid grown from water, biphenyl from toluene, and ibuprofen from polar and nonpolar sol®ents. Introduction The shape of crystalline organic solids is an important fac- actions between organic molecules in the solid state has led tor in the design and operation of solid]liquid separation sys- to a burgeoning of ideas of how these forces influence mor- tems. Crystal morphology affects the efficiency of down- phology. Saska and MyersonŽ. 1983 and Berkowitch-Yellen stream processesŽ. such as filtering, washing, and drying , and Ž.1985 were among the first to calculate solid-state energies influences material properties such as bulk density and me- of organic materials for the purpose of morphological model- chanical strength which play a major role in storage and han- ing. An especially important contribution has been the work dling. It also affects particle flowability, agglomeration, and of Roberts and co-workersŽ Docherty and Roberts, 1988a; mixing characteristics, as well as their redissolution proper- Clydesdale et al., 1991. who developed the program HABIT, ties. Since many organic solids produced in the chemical in- a fast and easy tool for calculating the interaction energy dustry are sold as end-products, the quality and efficacy of within organic crystals. these materials also depend in large part on crystal shape. The results of this research are models and methods that The focus in recent years on specialty chemical processes, provide estimates of the relative growth rates of various crys- like pharmaceuticals, has added to the demand for methods tal faces solely from knowledge of the internal crystal struc- that can predict and control crystal morphologyŽ Davey, 1991; ture. Since the construction of the growing crystal polyhe- Tanguy and Marchal, 1996. dron depends only on relative rates of growthŽ Hoffman and Since the early days of crystal shape modeling, the primary Cahn, 1972. , the crystal shape can be determined. These pre- focus has been the influence of the internal crystal structure dictions are often accurate for vapor grown crystals, but are on the external crystal habit. BravaisŽ. 1866 , Friedel Ž. 1907 , generally not accurate for solution growth. They fail to ac- Donnay and HarkerŽ. 1937 , as well as Hartman and Perdok count for the influence of the crystallizer solution and the Ž.1955 and others Ž see the review by Myerson and Gind, 1993 . , driving forceŽ. supersaturation that are widely thought to be all proposed similar relationships: the greater the surface major factors affecting shapeŽ Wells, 1946; Myerson and Gind, density of molecules on a face, the stronger the lateral inter- 1993. actions among molecules, and the more stable and slow grow- Of the many attempts to account for these factors, the most ing it must be. Thus, low Miller index faces are dense, slow quantitative success has been achieved by Bennema and co- growing, and dominate the crystal shape, as seen experimen- workersŽ. Liu and Bennema, 1993, 1996; Liu et al., 1995 . They tally. More recent work in this field has focused on the actual have applied the methods of statistical mechanics to examine magnitude of interactions within the crystal. The advent of solvent and supersaturation effects at the crystal-solution in- force-fields to calculate van der Waals and electrostatic inter- terface, and have combined these formulations with detailed growth kinetics}the well known theories of Burton, Cabrera Correspondence concerning this article should be addressed to M. F. Doherty. and FrankŽ. 1951 }as a means of predicting crystal shape AIChE Journal November 1998 Vol. 44, No. 11 2501 from solution. Their model requires solvent-crystal physical properties that are estimated from detailed experiments or molecular dynamics simulations. This new technique, how- ever, has not yet been widely applied. The need for lengthy simulations or experiments greatly limits its utility for process engineering applications. We propose a method for predicting crystal shape that can account for realistic processing conditions, and does not ne- cessitate extensive molecular simulation. It is based on simi- lar physical principles to those proposed by Bennema and co-workersŽ. Liu et al., 1995; Liu and Bennema, 1996 , but requires only knowledge of pure component properties that, for many systems, are readily available: the crystal structure and internal energy of the solid and the pure component sur- Figure 1. Circular 2-D nucleus on a crystal face. face free energy of the solvent. Solid]solvent interface prop- erties are estimated using a classical approach that we de- scribe later in the article. D The simplicity and ease of the method permits its use dur- critical size, G reaches a maximum; the critical radius at ing the discovery stage of an organic solids processŽ such as which this occurs is given by to guide experiments. In addition, it may be advantageous to g edge include this shape calculation, along with the traditional pre- VM r s Ž.3 dictions for crystal size and size distribution in the overall c Dm flowsheet design and optimization of these processes. A nucleus of a size equal to rc is in unstable equilibrium: Thermodynamics of Crystal Surfaces smaller ones redissolve; larger ones grow. The change in free energy associated with the creation of one nucleus of critical In a solution crystallizer with seeds or nuclei, a supersatu- size is ration causes the transfer of solute from solution onto the surfaces of individual crystals. With the addition of molecules 2 pgedge Vd onto a macroscopically flat crystal surfaceŽ. a crystal face , D s Ž.M Gc Ž.4 there is a change in the Gibbs free energyŽ.Ž kJrmol at fixed Dm T and P. of the entire system corresponding to Note that when the supersaturation is high, the critical size DGsy NDmqg A Ž.1 can be very small, down to a minimum of one molecule. Similar equations can be developed for nuclei of other Dmsmym where sat, the difference between the chemical shapes. For example, with a square nucleus of dimensions l potentials of the solute in solution and in the crystal phase by l, Eq. 3 and Eq. 4 become Ž.in units of energy per mole , N is the number of moles g r 2 g edge transferred, is the specific surface free energyŽ erg cm. , 2 VM l s 5 and A is the area of the new surface that is formed. The first c Dm Ž. term represents a decrease in free energy due to a phase change, and the second term represents an increase in free g edge 2 4Ž.VdM DG s 6 energy due to surface formation. The new surface is an edge c Dm Ž. surface, a surface of monolayer height wrapping around a molecule, or cluster of molecules. To indicate this, we will The general formula for a regular n-sided nucleus is write g as g edge. Equation 1 can be used to examine the free energy change g edge VM associated with one individual cluster of molecules, termed a l s2tan Ž.prn Ž.7 two-dimensionalŽ. 2-D nucleus. To a first approximation, the c Dm g edge 2-D nucleus is a disc with an isotropic , a volume of 2 2 g edge p r d and an edge area of 2p rd, where d is the interlayer Ž.VdM DG s n tan prn 8 spacingŽ. AÊ of the given face Ž see Figure 1 . Since N is the c Ž.Dm Ž. 3r D volume divided by the molar volume VM Žcm mol. G is a function of r as given byŽ unit conversion factors are omitted The free energy change can be expressed in units per mole of for clarity. critical nuclei by multiplying Eq. 8 by Avogadro's number. It can then be simplified by defining an edge free energy per Dm DGsyp rd2edgeq2p rdg Ž.2 mole of edge molecules VM f edge sg edge edge AM Ž.9 At low supersaturations and g edge )0, the free energy edge 2r change is positive and increases with r. However, at a certain where AM is the areaŽ cm mol of edge molecules. Since 2502 November 1998 Vol. 44, No. 11 AIChE Journal edge 2 s Ž AMAM. NV d, the free energy per mole of critical nuclei Evidence from crystal growth simulationsŽ Gilmer and Ben- can be expressed as nema, 1972.Ž , as well as from experiments Hunan et al., 1981; Jetten et al., 1984. , indicate that rough faces grow an order Ž.f edge 2 of magnitude faster than the slowest flat faces on a crystal. DG s n tan prn 10 c Ž.Dm Ž. The growth of flat faces is thought to occur by the move- ment of monolayer steps. Material is added to steps that propagate laterally and spread out over a face. Each com- This equation will be used later in the article as part of mod- plete layer results in the advancement of the face by a dis- els for predicting the growth rates of crystal faces.
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